... One of the most serious tuber quality concerns of US chip potato growers is stem-end chip defect, which is defined as a localized post-fry discoloration in and adjacent to the vasculature on the stem end portion of potato chips. The incidence and severity of stem-end chip defect vary with growing location and variety, but data describing this are not available. A multi-year and location study was ...

... Pathogenicity of 28 Polish isolates of F. sambucinum to potato tubers, their sensitivity to control agents, diversity among isolates and molecular methods of species identification were examined. All isolates were pathogenic to potato tubers and differences in pathogenicity were found. Isolates on the PDA were classified into three different color groups of mycelium (B - bright-beige, P - salmon p ...

... Spongospora subterranea f. sp. subterranea causes the potato diseases powdery scab on tubers and galls on roots, and occurs in most potato production areas worldwide. The pathogen was probably introduced to Europe from South America in the 16th century. Three different genotype clusters have been found worldwide: the genetically variable groups from South America (native), and, in contrast, the ne ...

... A three-year study was conducted in 1999, 2001, and 2002 to examine the influence of seed-borne inoculum and fludioxonil+mancozeb seed treatment on silver scurf (caused by Helminthosporium solani) development on progeny tubers at six locations under different potato rotations in the semi-arid U.S. Pacific Northwest. Disease-free pre-nuclear seed and diseased generation 3 seed was either treated or ...

... Labor and equipment costs are the main expenses in potato micropropagation. To determine if we could reduce costs associated with media sterilization, a disinfectant, sodium hypochlorite (NaOCl), in combination with microwave heating, were assayed as media sterilants. Incorporating a common 5 % NaOCl household beach at a concentration of 9 ppm (active chlorine) in media sterilized with an autoclav ...

... The transmission of PVY strains, PVYᴼ, PVYᴺ:ᴼ, and PVYᴺᵀᴺ via tuber cutting and plant wounding was investigated in PVY susceptible cultivars Shepody and Russet Norkotah. For the tuber cutting experiment, after one infected tuber was cut with a knife, four uninfected tubers were cut sequentially with the same knife without disinfecting it between the cuts. In the plant wounding experiments, wounds ...

... The Colorado potato beetle, Leptinotarsa decemlineata (Say) is a very serious pest of potatoes which is highly mobile and capable of rapid evolution of resistance to chemical control. Insect movement, resulting in gene flow between resistant and susceptible populations, is considered to be an important factor affecting the development and spread of insecticide resistance. We investigated the movem ...

... Dormancy hinders progress in attempts to fast track potato tuber generations. In this study, we evaluated the ability of gibberellic acid (GA) to overcome dormancy in freshly harvested tubers of eleven potato cultivars in two years of field trials. Tubers were wounded and dipped in 0, 10, 100, and 1000 ppm GA. Then, they were planted in the field five days later. Vine length and stem number were m ...

... ‘Candidatus Liberibacter solanacearum’ is an important pathogen of Solanaceous crops that causes zebra chip disease of potato. This pathogen is transmitted among plants by the potato psyllid Bactericera cockerelli. Within-plant spatial variability in Liberibacter infection impedes the ability to detect the bacterium before the onset of visible symptoms. The goal of our study was to test whether va ...

... Potato virus Y (PVY) strains have been defined based on genetic reactions in potato indicators expressing hypersensitive reaction (HR) response due to the presence of three different N genes, and also based on genomic information. Nine strains are known currently, with five PVY strains defined biologically, PVYᴼ, PVYC, PVYZ, PVYᴺ, and PVYᴱ. The genetic background of the majority of North American ...

... The aim of this study was to describe the variability in the root-associated bacterial community due to location and clone, and to determine whether an underlying core bacterial community exists that might benefit the quality of the potato crop. Root-associated bacterial communities from one growing season were examined with 454 sequencing. Variance analysis using perMANOVA attributed 45.4 % and 2 ...

... Understanding the influence of P in the pattern of production and partitioning of dry matter (DM) and nutrients to the tubers of potato cultivars is critical for development of rational fertilization strategies to optimize tuber yield. The objective of this study was to evaluate the effect of soil P availability (Low P: 10 mg dm⁻³ and High P: 111 mg dm⁻³) in the leaf nutrients concentration, nutri ...

... Potato cultivar Exploits and breeding clone F87084 have been considered resistant to Potato virus Y (PVY). To further explore the degree of resistance and whether the resistance is strain specific, these materials, together with cultivar Rochdale Gold-Dorée and breeding line F02010, were investigated for their response to different PVY strains including PVYᴼ, PVYᴺ:ᴼ, PVYᴺᵀᴺ and PVYᴺ. Both F02010 a ...

... Chlorpropham (CIPC) is a highly effective potato (Solanum tuberosum L.) sprout inhibitor. Some export regulations require CIPC or other sprout inhibitor to be applied to potatoes as a general phytosanitary measure. In addition, due to trucking and temporary storage issues, seed potatoes may be inadvertently exposed to CIPC. The objective of this 2-year study was to document the effects of several ...

... Optimizing the response of growth regulators depends in part on finding the most appropriate application rate and timing. Preliminary trials indicate that ethephon (2-chloroethylphosphonic acid) may be useful for improving potato (Solanum tuberosum L.) tuber appearance and skin color of red-skinned cultivars, but relatively little is known about optimum application practices. Two separate trials w ...

... The efficient use of fertilizer nitrogen (N) is critical for potato production in regions with sandy soils as concerns for groundwater contamination have become more apparent. The interactive effects of different hill shapes and distribution of in-season N fertilizer applications at various timings were evaluated in a 3-year potato (Solanum tuberosum L. cv. Russet Burbank) field experiment on a sa ...

... Potato (Solanum tuberosum L.) genotypes with relatively high yield level and resistance to the late blight disease are being developed by the International Potato Centre (CIP) and made available to developing countries. However, for effective breeding for high yield and late blight resistance, these CIP materials and locally adapted genotypes need to be evaluated and screened under target growing ...